(;GM[1]FF[4]SZ[19]
GN[If black tries to connect...]
PC[https://senseis.xmp.net/?BeginnerExercise251/Solution]AP[GoWiki:2009]
DT[2022-11-09]
C[Diagram from https://senseis.xmp.net/?BeginnerExercise251/Solution

If black tries to connect...]
PL[B]

AB[na][ra][nb][oc][ld][md][nd][od][pd][qd][rd][le]
AW[lb][mb][ob][pb][qb][rb][rc][me][ne][oe][pe]

;B[sb]C[B1]MN[1]
;W[sc]C[W2]MN[2]
;B[sa]C[B3]MN[3]
;W[qa]C[W4]MN[4]

;
)
